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9 steels in halide solutions (F 2 , Cl 2 , Br 2 and I 2 ) has been investigated. The study involved cyclic potentiodynamic polarisation tests with subsequent examination of the specimens by both optical and scanning electron microscopy. Values of the critical concentrations of halide ions, [X 2 ] cr , beyond which pitting occurs, as well as breakdown potentials for pitting in chloride solution, have been established. In addition, the effect of the temperature over the range of 5-80uC on the critical chloride ion concentration [Cl 2 ] cr has been investigated and it has been found that temperature has a negligible effect beyond 40uC.

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Phosphoric acid concentration (5-85%) effects on the corrosion behaviour of austenitic Fe-18Cr-12Mn-N steel have been studied by potentiodynamic polarisation measurements. After the anodic polarisation, both the film composition and the electronic structure have been investigated by X-ray photoelectron spectroscopy. The specimen surface examinations have been carried out by scanning electron microscopy. The results of the corrosion behaviour of the steel at issue have been compared to those relevant to two trademark materials [austenitic stainless steels AISI 304 (Fe-18Cr-9Ni) and X14AC15 (Fe-14Cr-15Mn-N)] and developed under the same test conditions.

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